全轻混凝土梁柱边节点钢筋应变研究

STUDY ON THE STRAIN OF REINFORCED FULL LIGHTWEIGHT CONCRETE BEAM COLUMN JOINTS

通过2个全轻混凝土框架梁柱边节点在0.1和0.3轴压比作用下的拟静力荷载试验,对全轻混凝土框架梁柱边节点的抗震性能进行研究,分析全轻混凝土框架梁柱边节点在不同轴压比下试件梁端、节点核心区的钢筋应变。试验表明,轴压比增大,箍筋对节点核心区的约束作用增大,但对节点核心区柱纵筋受力没有明显影响,同时,混凝土一旦开裂破坏,箍筋应变会出现明显的突变,梁端纵筋应变随之增大,从而对全轻混凝土框架梁柱边节点的抗震性能进行评价。

Through the low cycle reciprocal load test of 2 side joints under different axial compres- sion ratio of full lightweight concrete frame beam column, exploratory research on seismic behavior of concrete frame beam column joints is carried out steel strain of full lightweight concrete frame beam column joint specimens on the beam end, and the joint core is analyzed. Test shows, axial compression ratio increases, the constraint effect of stirrups in joint core increases, but the stress of joint core of the column longitudinal reinforcement has no obvious influence. At the same time, once concrete is cracked and stirrup strain will appear obvious mutation, the beam longitudinal reinforcement strain increases, and seismic performance of full lightweight concrete frame beam column joints was evaluated.